package game.johan.engine;
/*
Copyright (C) 2013 Johan Ceuppens

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
import java.util.ArrayList;
import java.util.List;

/*
 * This class can store surfacelist and surface objects
 * It can fetch the next surface from these inside 
 * the _buffer variable
 * 
 * Memento class inside
 */

class Caretaker<O>
{
	public class Memento<O>
	{
		private final O _o;
		public Memento(O o) {
			_o = o;
		}
		public O get() {
			return _o;
		}
	}
	
	List<Memento<O>> _saves = new ArrayList<Memento<O>>();
	O _save;
	
	public void save(O state) {
		_saves.add(new Memento<O>(state));
	}
	
	public void restore() {
		if (_saves.size() == 0)
			return;
		
		int l = _saves.size()-1;
		_save = (O)_saves.get(l);
		_saves.remove(l);
	}
	
}